High Bilirubin in Cats (Jaundice): Causes, Treatment & What to Expect
Quick Answer: Cat Bilirubin Levels
Normal bilirubin: 0.1-0.3 mg/dL. Hepatic lipidosis (fatty liver) is the #1 cause of jaundice in cats — and with early treatment, 60-80% of cats recover. If your cat has stopped eating and is turning yellow, this is likely the cause.
Seeing your cat turn yellow is frightening. Jaundice means bilirubin is building up in your cat's body — but many causes are treatable, especially when caught early. This guide explains what's happening and what to expect.
Have your cat's bloodwork results?
Upload to see how bilirubin relates to liver enzymes. High ALP with normal GGT often points to hepatic lipidosis — a pattern that helps guide treatment.
Analyze My Cat's BloodworkWhat Is Bilirubin?
Bilirubin is a yellow pigment created when red blood cells break down. Normally, the liver processes bilirubin and excretes it in bile. When this process is disrupted, bilirubin accumulates in the blood and tissues, causing the characteristic yellow color of jaundice.
Important for cats: Unlike dogs, cats should never have bilirubin in their urine. If your cat's urinalysis shows any bilirubin, it confirms elevated blood levels and warrants immediate investigation.
Bilirubin Levels: What the Numbers Mean
| Bilirubin Level | Severity | Appearance | Action |
|---|---|---|---|
| 0.1-0.3 mg/dL | Normal | No jaundice | No action needed |
| 0.4-2.0 mg/dL | Mild-Mod | Subtle to visible yellowing | See vet within 24 hours |
| 2.0-5.0 mg/dL | Moderate | Obvious jaundice | Urgent — hospitalization often needed |
| 5.0-10.0 mg/dL | High | Deep yellow/orange | Intensive care needed |
| >10 mg/dL | Severe | Intense yellow | Emergency — may need surgery |
The Most Common Cause: Hepatic Lipidosis
Why This Happens to Cats
Hepatic lipidosis (fatty liver disease) is the #1 cause of jaundice in cats. When a cat stops eating — for any reason — their body mobilizes fat for energy. In cats, this fat can overwhelm the liver, causing it to fail.
Key point: Just 2-3 days of not eating can trigger this, especially in overweight cats. This is why any cat that hasn't eaten for 24-48 hours needs veterinary attention.
The good news: With aggressive nutritional support (usually a feeding tube), 60-80% of cats with hepatic lipidosis recover fully.
Diagnostic Clue: ALP and GGT Pattern
Other Causes of Jaundice in Cats
Need help understanding your cat's results?
Upload your cat's bloodwork to see the pattern. High ALP with normal GGT suggests hepatic lipidosis. Elevated ALT and GGT together may indicate cholangitis.
Analyze My Cat's ResultsSigns of Jaundice in Cats
Check these areas for yellow discoloration:
- • Whites of the eyes (sclera) — often the first place to notice
- • Gums and inside of lips — should be pink, not yellow
- • Inner ear flaps — thin skin shows color changes
- • Belly or inner thighs — where fur is sparse
Other signs that often accompany jaundice:
- • Not eating (anorexia) — often the first sign, especially with hepatic lipidosis
- • Lethargy — sleeping more, less interested in surroundings
- • Weight loss — can be rapid
- • Vomiting — especially with pancreatitis or liver inflammation
- • Dark yellow or orange urine — bilirubin in urine
- • Hiding — cats hide when they feel unwell
Prognosis by Condition
- Hepatic Lipidosis: 60-80% survival with aggressive nutritional support. Feeding tubes are typically needed for 4-6 weeks. Full recovery is possible.
- Cholangitis/Cholangiohepatitis: Variable depending on type. Neutrophilic (bacterial) often responds well to antibiotics. Lymphocytic may need long-term steroids.
- Pancreatitis-related obstruction: Often improves with treatment of pancreatitis. May take days to weeks.
- FIP: Historically poor prognosis, but new antiviral treatments (GS-441524) show promising results.
- Mycoplasma haemofelis: Usually responds well to antibiotics (doxycycline). Good prognosis.
- Liver cancer: Depends on type and spread. Some primary liver tumors are surgically removable.
Key Point
The most common cause of jaundice in cats — hepatic lipidosis — is also one of the most treatable. With early, aggressive nutritional support, most cats recover. Don't wait to seek care.
Treatment Approach
Treatment depends on the underlying cause:
- Hepatic Lipidosis: Feeding tube (esophagostomy or nasogastric tube), liver support (SAMe, ursodiol), anti-nausea medications, IV fluids. Feeding must be aggressive — calories matter.
- Cholangitis: Antibiotics for bacterial infection, immunosuppressants for lymphocytic type, ursodiol for bile flow.
- Pancreatitis: Pain management, anti-nausea medications, IV fluids, nutritional support.
- IMHA: Immunosuppressive medications, blood transfusions if needed.
- All jaundiced cats: Often receive vitamin K (important for clotting), IV fluids, and supportive care.
Concerned About Your Cat's Jaundice?
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When to Seek Emergency Care
Go to the emergency vet if:
- Your cat hasn't eaten in 48+ hours (risk of hepatic lipidosis)
- Gums are pale or white (severe anemia)
- Your cat is very weak or collapsed
- There's severe vomiting or diarrhea
- You notice difficulty breathing
- Jaundice appeared very suddenly
- Your cat has a swollen abdomen
See regular vet within 24 hours if:
- Mild jaundice noticed but cat is still eating (even reduced amounts)
- Cat is alert and moving around
- No vomiting or diarrhea
Even mild jaundice in cats always requires veterinary evaluation — but if your cat is stable, you can wait for a morning appointment.
Related Reading
Understand Your Cat's Liver Values
Upload your cat's bloodwork to VetLens and instantly see:
- ✓ How bilirubin relates to ALT, ALP, and GGT
- ✓ Pattern recognition (hepatic lipidosis vs cholangitis vs obstruction)
- ✓ Red blood cell status if anemia is suspected
- ✓ Questions to ask your vet
Frequently Asked Questions
What is a normal bilirubin level in cats?
Normal total bilirubin ranges from 0.1-0.3 mg/dL. Unlike dogs, any bilirubin in cat urine is abnormal. Visible jaundice typically appears when bilirubin exceeds 2 mg/dL.
What is the most common cause of jaundice in cats?
Hepatic lipidosis (fatty liver disease) is the #1 cause. It occurs when cats stop eating and fat accumulates in the liver. Overweight cats are at higher risk, but any cat can develop it.
Can a cat recover from jaundice?
Yes. Hepatic lipidosis has 60-80% survival rates with aggressive nutritional support. Cholangitis and pancreatitis are often treatable. Prognosis depends on the underlying cause and how quickly treatment begins.
Why is my cat not eating and turning yellow?
This is the classic presentation of hepatic lipidosis. When cats stop eating, their bodies mobilize fat, which can overwhelm the liver. This requires immediate veterinary care — feeding through a tube is often necessary.
How long does jaundice take to resolve in cats?
Once the underlying cause is treated, visible jaundice typically resolves within 1-2 weeks. However, hepatic lipidosis often requires 4-6 weeks of feeding tube support for full liver recovery.
Is jaundice in cats always fatal?
No. Many causes of jaundice are treatable. Hepatic lipidosis, the most common cause, has good survival rates with proper care. Early intervention is key to the best outcomes.
What does it mean if my cat has bilirubin in their urine?
Any bilirubin in cat urine is abnormal (unlike dogs, where small amounts can be normal). This confirms elevated blood bilirubin levels and requires veterinary investigation.